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Folding Bikes Discuss the unique features and issues of folding bikes. Also a great place to learn what folding bike will work best for your needs.

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Old 09-27-05, 05:10 PM   #1
Boe
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Twentyfixer

Folding conversion. From scrap to baby fixed gear.



Stripped down. Threw away most of it.


Front wheel built up. Schwalbe Marathon slicks.
Rim han been polished with rotating brush.


Rear wheel built up. Surly trackcog on a cheap hub i had in my parts bin. Respaced to 120mm.
Suicide hub without a lockring. Rotafixa method not as strong on a 20" wheel as on a 700c though... Used some green Loctite.


Sweet wheelpair, just built up. 36 on the rear and 28 up front.


Sanded, primed and rattlecan spray. Black and Gold. Mmm.


Bike is comming together!






Parts to clean in one box, parts to use in another, and parts to keep in a third.


Rotafixa


Rotafixa


Getting ready for the streets!


Close up with wide angle lens gives some strange perspective


Golden Triton headbadge, golden fork. Fenders and bigger tires can be fitted for the winter.






Dura Ace track pedals, Christophe straps. Shimano 600 cranks.



Folding...


I have to get a little longer and nicer seatpost.


Nice chrome on the stem.


Really thin and uncomfortable handlebar tape. I dont ride for pleasure so who gives..

The bike is amazingly quick! Cant go very fast with my gear inches though, but i can really sprint away! And cornering is insane! Its a rascal in traffic!

"Thoose are cute, are thoose the wheels?"


/Boe
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http://fixed.se
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Old 09-27-05, 06:51 PM   #2
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looks sweeeeeeet! props on the documentation! great to see all those photos.
so it that frame a dawes kingpin?
did you replace the bb?
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Old 09-28-05, 02:41 AM   #3
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The frame is a Triton, never heard of it, anyone have a clue?

Yes, replaced the bb with a square taper so I could run some nicer cranks. Im not a fan of cottered..
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Old 09-28-05, 10:09 AM   #4
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can you be more specific about what you did with the bottom bracket? i passed up a generic folder recently, b/c i was worried i wouldn't be able to replace the bb. i'm starting to suspect that they are all basically the same. it makes sense that they all probably copied raleigh as much as possible.
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Old 09-28-05, 10:58 AM   #5
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cogs are not relevant, use something like gear inches or gain ratio to compare between different bikes.
http://sheldonbrown.com/gears/

If you're running 80" on your 700c bike, you have to have 52x12 on your 406 (20") bike.


Regarding the BB i just put in a standard shimano square tapered bottom bracket. 1.370" X 24 English threading.
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Old 09-28-05, 11:26 AM   #6
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Quote:
Originally Posted by Boe
Regarding the BB i just put in a standard shimano square tapered bottom bracket. 1.370" X 24 English threading.
thanks...
btw how many tpi is that?
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Old 09-28-05, 11:29 AM   #7
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24tpi
http://sheldonbrown.com/gloss_bo-z.html#bottom
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Old 09-29-05, 06:17 AM   #8
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Never heard of the Triton either. Very nice conversion man! Impressive. I like the old school "tugnuts" on the dropouts. Very handy on a fixie, did you mod. those to fit or did they come with the frame?

But i gotta say that frame looks a LOT like the other frames i refer to in another post:

" I think! the folder he converted is a cheap folder that can be bought new or second hand in NL for anything between E 30 and E 110, but i could be wrong!. They are sold under many brand names but IMO they are mostly (90%) crap and not worth the money at all. Mostly they have curved tubes, ****ty metal, weak welds and bad paint. Sure they have standard parts and if you clean them up and they can look great (like any frame) but they tend to break and rust like crazy, the steel and coating is just very substandard. Though again maybe he snagged a better one, some of the older ones were decent. But maybe the owner can enlighten us all. I'd be extremely suprised if it is as good as a Twenty though. The hinge isn't as sturdy i think nor is the frame reinforced with an "extra" triangle."

I used to own a few of these folders and had some real bad experiences. One just cracked all the way through right by the BB! This isn't really that odd if one looks at the geometry. My bike always felt flexy like hell (in a way it seems almost like suspension) but it isn't strange that the metal will fatigue eventually. And i am not a n extreme or heavy biker.

Looking at the original frame's condition this seems to suggest that my comments about the metal quality and coating of these type of folders holds some water. Either that or it was extremely neglected.

Much kudos on making something out of a frame that looked destined for the landfill though. But i also feel it seems a pity to put such nice components (Dura Ace!) on a frame that may likely let you down. I hope this one is an exception though. Keep us posted!

Last edited by v1nce; 09-29-05 at 06:22 AM.
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Old 09-29-05, 06:29 AM   #9
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I do agree with you on frame quality, this frame will probably go "catastrophical failure" on me. During the build up, I had to use my vaccum cleaner to clean out the tubes of rust.. Something like one pint of rust in there. Obviously i didnt pay anything for this bike, and all of the components came from my parts bin, and will get transfered to decent bikes when they are more needed elsewhere. However, I really enjoy working with bikes, and I had a great sunday building her up!

Flexy, hehe yeah! Something like 2" of compliance isn't that bad for a cardtail when dropping of a curb.

Your Raleigh looks really neat, love that color! Maybe one day I will stumble upon a decent twenty incher. Until then, Im riding the hell out of my scrapheap, hehe!
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Old 09-29-05, 07:52 AM   #10
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Great post - nice to see all those photos - can you give me some info about the 'Rotafixer' pictures and method? I'm puzzled as to what's going on with the doubled-up chain...!

It's easy to tell a twenty from more generic frames by the frame geometry and horizontal hinge. When Raleigh phased out the Twenty for cheaper import frames called 'biancas' they looked a lot like this one with that swooping curve to the basically one-piece seattube/downtube. It's looking nice - I'm guessing it's pretty light! Lighter than a twenty I'm sure with the more minimal amount of metalwork. Is the hinge strong enough? Looks like you need to treat the rust on that seatpost too!

My twenty is running 14->54 which I'm upgrading to 14->56 at the weekend to make it a little more speedy at the top end though I'm sure it won't add too much. It's still low enough to start at the lights without having to stomp too hard on the pedals though going up to 56 will - I fear - take it out of my knees on the last steep climb on my commute home.

I would go down to 12 and stay at 54 but for the fact the chain fouls the seatstays with a sprocket of such a small diameter and that it is severely glued on with the uk equivalent of JB Weld!

Nice one. Thanks for posting the pictures...
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Old 09-29-05, 09:31 AM   #11
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Yeh i second that: many thanks for having such nice pics and describing the proces! We need more of that in these boards (though it is probably terrible for bandwidth ha ha). Yeah ride that baby into the ground and then move on! Sounds good to me. You didn't do all that work in one Sunday did you?! That's crazy.

How did you get such good lighting on those pics anyway? Flash, lots of extra lighting/daylight. Very Crisp, nice.

Thanks for the compliments on my wheels. I have actually uglied it up a little since those last pics, i had to because of theft. It is still pretty sweet though. If i ever find my digi camera i might post some more pics. I also made this kinda nifty small basket for the front out of a 5 Liter plastic jerry can. I feel like a dork/E.T. which is cool.

Bianca's! Yeah that's it! A lot of the bikes i was referring to bear that name! I am sure. also Weekendstar and Rhino. Although the latter are really really terrible/the more modern versions. And all those curved tube folders are def. light, much lighter than 20's.
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Old 09-29-05, 08:31 PM   #12
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what about motobecanes and peugeots? either of these any good? there has to be a decent alternative to the twenty. and not that boring new stuff either.
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Old 09-30-05, 01:12 AM   #13
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Thank you all for the great feedback!

First, The rotafixa method is one of the most important things to learn if you are builing fixed gears. It a very convenient way to secure that rear cog.
Learn more about it here:
http://204.73.203.34/fisso/eng/schpignone.htm

Well, actually I did it all last sunday. No church that day though, obviously.
The pictures are shot in my hall, I do however have a 100w bulb there, and they are shot with my DSLR (Canon EOS 10D) which produce really sexy shots of everything you point it to.

The hinge is flexy to say the least. When my little heavier friend rode it, it sure looked weak. The seatpost is to be replaces as soon as I get my hands on a longer 25.8mm.
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Old 09-30-05, 04:42 AM   #14
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@ Kill. Well of course i am sure there must be other quite decent options but to be honest i have yet to see many. Here in NL decent options include the Batavus, the Gazelle Kwikstep and maybe 1 or 2 more. Although i would say (just from looking, not actual hands on experience) non of them are quite as good as the 20, but maybe i am misstaken. After all these bikes are also 25 or more years old and many seem just fine as well. As for the Brands you mention, i can't ever remember seeying folders by them but i'd be much surprised if they never made any.

@ Boe: Ahh, the camera and lighting make a lot of sense. I own a Cheapo Trust and a 10 Watt 'eco' bulb thingy. Can't take decent pictures indoors to save my live without lots of additional lighting. Outdoors is fine though.

That rotafix method is very interesting and simple. Cool! Do these type of wheels/set ups work out for you consistently? Experience Any slips or problems or just smooth sailing?

Last edited by v1nce; 09-30-05 at 04:48 AM.
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Old 02-02-06, 04:21 AM   #15
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I'm bumping this thread as a public service.
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Old 02-02-06, 11:27 PM   #16
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I'm bumping this thread as a public service.
I'm confused...I am a little tired, but where's the insults? Really, I'm confused. juan162
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Old 02-03-06, 12:10 AM   #17
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I'm bumping this thread as a public service.
Thanks, I missed this one the first time through. Very nice walkthrough of the process.
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Old 02-03-06, 12:53 AM   #18
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Quote:
Originally Posted by juan162
I'm confused...I am a little tired, but where's the insults? Really, I'm confused. juan162
Juan, this is the Folding forums, not ss/fixie, so there are no insults. Still confused?
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Old 02-03-06, 04:13 AM   #19
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nowt wrong with the occasional tactical bump if you ask me. but i'll insult you if you really want... smelly!
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Old 02-03-06, 09:30 AM   #20
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Quote:
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nowt wrong with the occasional tactical bump if you ask me. but i'll insult you if you really want... smelly!
Hey, I resemble that remark!
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